linux-kernel - Re: [PATCH] uprobes: fix kernel info leak via "[uprobes]" vma

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Message-ID: <20240929145000.GA8931@redhat.com>
Date: Sun, 29 Sep 2024 16:50:00 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Liao, Chang" <liaochang1@...wei.com>,
	Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] uprobes: fix kernel info leak via "[uprobes]" vma

On 09/29, Masami Hiramatsu wrote:
>
> On Thu, 26 Sep 2024 18:29:01 +0200
> Oleg Nesterov <oleg@...hat.com> wrote:
>
> > xol_add_vma() maps the uninitialized page allocated by __create_xol_area()
> > into userspace. On some architectures (x86) this memory is readable even
> > without VM_READ, VM_EXEC results in the same pgprot_t as VM_EXEC|VM_READ.
>
> Good catch!
> I think we push this urgently and send it to stable tree too, right?

Agreed, can you route this patch?

> Fixes: d4b3b6384f98 ("uprobes/core: Allocate XOL slots for uprobes use")
> Cc: stable@...r.kernel.org

Will add this or should I resend with these tags included ?

perhaps the changelog should mention that debugger can read this memory
regardless of pgprot_t...

> Acked-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>

Thanks!

Oleg.